Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2010-04-06
Published in JCAP 1008:008,2010
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
Version matching the one published in JCAP, 2 typos fixed, references added. 30 pages, 20 figures
Scientific paper
The methods of effective field theory are used to study generic theories of inflation with a single inflaton field and to perform a general analysis of the associated non-Gaussianities. We investigate the amplitudes and shapes of the various generic three-point correlators, the bispectra, which may be generated by different classes of single-field inflationary models. Besides the well-known results for the DBI-like models and the ghost inflationary theories, we point out that curvature-related interactions may give rise to large non-Gaussianities in the form of bispectra characterized by a flat shape which, quite interestingly, is independently produced by several interaction terms. In a subsequent work, we will perform a similar general analysis for the non-Gaussianities generated by the generic four-point correlator, the trispectrum.
Bartolo Nicola
Fasiello Matteo
Matarrese Sabino
Riotto Antonio
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